Catalog Number - 9502S-31-MB

The 9502S‑31‑MB AQ™ Screw Caps are selected for chromatography workflows requiring high purity septa materials, easier needle penetration, and dependable autosampler performance. The bonded white silicone rubber/tan PTFE pre‑slit septa design helps minimize septa movement, dislodgement, and septa plunge during repeated injections.

Manufactured with blue knurled polypropylene caps and ultra‑pure white silicone/tan PTFE pre‑slit septa, these caps are designed for use with standard 9‑425 thread, 12 × 32 mm autosampler vials commonly used in LC‑MS, LC‑MS/MS, GC‑MS, and HPLC laboratories. The bright white silicone rubber contains no pigments, helping minimize extractables and background interference in sensitive analytical methods.

Ultra‑Pure Pre‑Slit Septa

• White silicone rubber/tan PTFE pre‑slit septa

• Ultra‑pure septa materials

• Designed for low background interference

• Easier autosampler needle penetration

✅ Optimized for high‑sensitivity MS workflows

Bonded Septa Construction

• Bonded septa design

• Helps reduce septa movement

• Minimizes septa dislodgement

• Supports repeated autosampler injections

✅ Reliable injection reproducibility

Instrument Compatibility

• Recommended for systems comparable to:

  • Waters® autosamplers

• Suitable for HPLC and MS workflows

• Alternative to Waters® Certified caps

✅ Dependable compatibility for routine analytical systems

Standard 9‑425 Compatibility

• Fits 9‑425 screw thread vials

• Compatible with:

  • 12 × 32 mm autosampler vials

  • Industry standard autosampler formats

✅ Broad autosampler compatibility

Knurled Polypropylene Caps

• Blue polypropylene construction

• Knurled exterior improves:

  • Grip

  • Installation

  • Removal

• Secure sealing performance

✅ Convenient laboratory handling

High Purity Chromatography Applications

• Suitable for:

  • LC‑MS analysis

  • LC‑MS/MS workflows

  • GC‑MS applications

  • HPLC analysis

• Cost‑effective alternative to certified consumables

✅ High purity performance without premium certified pricing

✅ Also available: Case Quantity AQ™ 9502S‑31‑MB Screw Caps